  
  var defaultWords = 'ABCD';

  exports.say1 = function (words) {
       if(typeof(words)==='undefinded'||words!=null){
          return words;   
       }else{
          return '1.' + defaultWords;
       }
  };
  exports.say2 = function (words) {
	    if(typeof(words)==='undefinded'||words!=null){
	       return words;   
	    }else{
	       return '2.' + defaultWords;
	    }
  };
  exports.say3 = function (words) {
	    if(typeof(words)==='undefinded'||words!=null){
	       return words;   
	    }else{
	       return '3.' + defaultWords;
	    }
};   